NGC 2506


Ron Brecher

Ontario, Canada


SBIG STL-11000M camera, Baader RGB filters, 10″ f/6.8 ASA astrograph, Paramount MX. Guided with QHY5 camera and and an 80 mm f/6 guide scope. Focused with FocusMax. Acquisition and guiding with TheSkyX. Automation with CCD Commander. All prep-processing and processing in PixInsight. Shot from my SkyShed in Guelph, Ontario. Gibbous moon. Very good transparency and poor seeing throughout.

10x5m R, 9x5m G, and 10x5m B, all unbinned frames (total=2hr25m).

Complete processing information is available here – Hope you enjoy it!

Finally, a clear night!

NGC2506 is an open cluster located in the constellation Monoceros, the Unicorn. There are many beautiful objects in this constellation (including the Rosette Nebula), so NGC2506 (like most open clusters) often gets overlooked. This cluster lies about 11,300 light years from us and includes hundreds of stars. I find it difficult to discern where the cluster ends and the background field of stars begins; the cluster just seems to fade away until it blends in.

Following my own advice (, I acquired this image in a single moonlit night.